Master Lock Model 410BLU 410 Thermoplastic Safety Padlock. 1-12in (38mm) wide 1-34in (44mm) tall Thermoplastic black body, shackle with 1-12in (38mm) clearance. Designed exclusively for lockout tagout applications. Durable, lightweight, non-conductive Thermoplastic lock body. Customize on-site with permanent, write-on labels. Compliance with “One Employee, One Lock, One Key” directive. High security, reserved-for-safety cylinder. Key retaining – ensures that padlock is not left unlocked. Keyed different, 6-pin tumbler with over 40,000 available key changes cylinder, Shelf Pack Qty 6, Master Carton Qty 36.